LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2012 >> IS 250 Base, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0190-P062F)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) >> Typical Enabling Conditions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Typical Enabling Conditions

Monitor runs whenever following DTCs are not present P0010, P0020 (OCV (bank 1, 2))
P0011, P0021 (VVT system (bank 1, 2) - advance)
P0012, P0022 (VVT system (bank 1, 2) - retard)
P0013, P0023 (Exhaust OCV (bank 1, 2))
P0014, P0024 (Exhaust VVT system (bank 1, 2) - advance)
P0015, P0025 (Exhaust VVT system (bank 1, 2) - retard)
P0016, P0018 (VVT system (bank 1, 2) - misalignment)
P0017, P0019 (Exhaust VVT system (bank 1, 2) - misalignment)
P0031, P0032, P0051, P0052 (A/F sensor heater)
P0037, P0038, P0057, P0058 (HO2 sensor heater)
P0102, P0103 (MAF meter)
P0115, P0117, P0118 (ECT sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0136, P0137, P0138, P0139 (HO2 sensor bank 1)
P014C, P014D, P014E, P014F (A/F sensor - slow response)
P0156, P0157, P0158, P0159 (HO2 sensor bank 2)
P015A, P015B, P015C, P015D (A/F sensor - delayed response)
P0171, P0172, P0174, P0175 (Fuel system)
P0301, P0302, P0303, P0304, P0305, P0306 (Misfire)
P0335 (CKP sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0351, P0352, P0353, P0354, P0355, P0356 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
P0500 (Vehicle speed sensor)
P0607 (HO2 sensor - sensor 2)
P2195, P2196, P2197, P2198 (A/F sensor - rationality)
P2237, P2240 (A/F sensor - open)
P2238, P2241, P2252, P2255 (A/F sensor - low impedance)
P2239, P2242, P2253, P2256 (A/F sensor - high impedance)
Battery voltage 11 V or more
IAT -10°C (14°F) or more
Engine coolant temperature 75°C (167°F) or more
Atmospheric pressure 76 kPa(abs) [570 mmHg(abs)] or more
Idle Off
Engine speed Less than 4000 rpm
A/F sensor status Activated
Fuel system status Closed loop
Engine load 10% or more, and less than 75%
All of the following conditions are met: Condition 1, 2 and 3
1. MAF 5 g/sec or more, and less than 45 g/sec
2. Front catalyst temperature (estimated) 600°C (1112°F) or more, and less than 840°C (1544°F)
3. Rear catalyst temperature (estimated) 600°C (1112°F) or more, and less than 840°C (1544°F)
Shift position 4th or higher